Spring

Spring Annotation

• @RequestMapping @RequestBody
  • Post JSON to spring REST webservice

Spring Config

• spring.config.name and spring.config.location are used very early to determine which files have to be loaded so they have to be defined as an environment property (typically OS env, system property or command line argument).

  这两个配置项放在配置文件里面是无效的

• Spring Boot uses a very particular PropertySource order that is designed to allow sensible overriding of values, properties are considered in the following order¹:

  • Command line arguments.
  • Properties from SPRING_APPLICATION_JSON (inline JSON embedded in an environment variable or system property)
  • JNDI attributes from java:comp/env.
  • Java System properties (System.getProperties()).
  • OS environment variables.
  • A RandomValuePropertySource that only has properties in random.*.
  • Profile-specific application properties outside of your packaged jar (application-{profile}.properties and YAML variants)
    • 多个profile，越靠后引入优先级越高
    • 一个profile文件里使用spring.profiles.include引入的配置，优先级比本文件内的配置高
  • Profile-specific application properties packaged inside your jar (application-{profile}.properties and YAML variants)
  • Application properties outside of your packaged jar (application.properties and YAML variants).
  • Application properties packaged inside your jar (application.properties and YAML variants).
  • @PropertySource annotations on your @Configuration classes.
  • Default properties (specified using SpringApplication.setDefaultProperties).

• Creating your own auto-configuration

  • 使用@Configuration注解来实现auto-configuration类.
  • @AutoConfigureAfter, @AutoConfigureBefore, @AutoConfigureOrder指定顺序.
  • 定位需要自动配置的类, spring boot 会检查已发布的jar包里是否存在文件META-INF/spring.factories. 文件内容如下:

      org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
      com.mycorp.libx.autoconfigure.LibXAutoConfiguration,\
      com.mycorp.libx.autoconfigure.LibXWebAutoConfiguration
    

Disabling specific auto-configuration

Disabling specific auto-configuration

使用@EnableAutoConfiguration剔除不想引用的自动配置类

@Configuration
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class MyConfiguration {
}

或者在properties文件里使用配置项spring.autoconfigure.exclude，例如

spring.autoconfigure.exclude=com.lowzj.example.MyAutoConfiguration1,\
  com.lowzj.example.MyAutoConfiguration2

¹. Spring Externalized Configuration ↩